中国物理B ›› 2013, Vol. 22 ›› Issue (7): 77502-077502.doi: 10.1088/1674-1056/22/7/077502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

R-site cation randomness effect in thec A-site ordered Y0.5La0.5BaMn2O6 compound

高庆庆a, 李静波b, 李冠男a, 饶光辉c, 骆军a, 刘广耀a, 梁敬魁a   

  1. a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    b School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
    c School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
  • 收稿日期:2013-03-15 出版日期:2013-06-01 发布日期:2013-06-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50872148, 51072225, and 11074295) and the Natural Science Foundation of Guangxi Province, China (Grant No. 2012GXNSFGA060002).

R-site cation randomness effect in thec A-site ordered Y0.5La0.5BaMn2O6 compound

Gao Qing-Qing (高庆庆)a, Li Jing-Bo (李静波)b, Li Guan-Nan (李冠男)a, Rao Guang-Hui (饶光辉)c, Luo Jun (骆军)a, Liu Guang-Yao (刘广耀)a, Liang Jing-Kui (梁敬魁)a   

  1. a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    b School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
    c School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
  • Received:2013-03-15 Online:2013-06-01 Published:2013-06-01
  • Contact: Li Jing-Bo E-mail:lijb@bit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50872148, 51072225, and 11074295) and the Natural Science Foundation of Guangxi Province, China (Grant No. 2012GXNSFGA060002).

摘要: The R/Ba-ordered and R-site mixed compound Y0.5La0.5BaMn2O6 has been synthesized in which (Y, La) and Ba are regularly arranged while Y and La randomly occupy the R-site. Y0.5La0.5BaMn2O6 has a tetragonal unit cell with a space group of P4/mmm. A structural transition between tetragonal and orthorhombic is observed at about 325 K by X-ray powder diffraction (XRD). Thermal magnetic measurement shows the occurrence of an antiferromagnetic transition at the temperature TN~190 K. Anomalies in magnetization, resistivity and lattice parameters observed around 340 K indicate a charge/orbital order transition accompanying the structural phase transition. R-site randomness effect is discussed to interpret the different properties of Y0.5La0.5BaMn2O6 between NdBaMn2O6 and SmBaMn2O6.

关键词: A-site ordering, structural transition, charge/orbital ordering, X-ray powder diffraction

Abstract: The R/Ba-ordered and R-site mixed compound Y0.5La0.5BaMn2O6 has been synthesized in which (Y, La) and Ba are regularly arranged while Y and La randomly occupy the R-site. Y0.5La0.5BaMn2O6 has a tetragonal unit cell with a space group of P4/mmm. A structural transition between tetragonal and orthorhombic is observed at about 325 K by X-ray powder diffraction (XRD). Thermal magnetic measurement shows the occurrence of an antiferromagnetic transition at the temperature TN~190 K. Anomalies in magnetization, resistivity and lattice parameters observed around 340 K indicate a charge/orbital order transition accompanying the structural phase transition. R-site randomness effect is discussed to interpret the different properties of Y0.5La0.5BaMn2O6 between NdBaMn2O6 and SmBaMn2O6.

Key words: A-site ordering, structural transition, charge/orbital ordering, X-ray powder diffraction

中图分类号:  (Orbital, charge, and other orders, including coupling of these orders)

  • 75.25.Dk
61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)